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Photometric observations of RR Lyrae covering half a century
4403 photographic observations obtained in the years 1943-1950, 2611white light observations from the years 1550-1957, altogether 31794 UBVobservations collected in the years 1958-1981 and 7135 observations madein the Stromgren uvby and Hβ wide/narrow band photometric systembetween 1990 and 1993 are published,
| The visual surface brightness relation and the absolute magnitudes of RR Lyrae stars. II - RR Lyrae and X ARIETIS
The theoretical surface brightness relation for RR Lyrae stars has beencombined with new VR photometry to determine distances, radii, andabsolute magnitudes for X Arietis and RR Lyrae. For X Arietis, apulsational variation in the radius from 5.06 solar radii to 5.96 solarradii, a distance of 495 + or - 50 pc, and an intensity mean absolutemagnitude of +0.59 + or - 0.25 is obtained. The corresponding quantitiesfor RR Lyrae are 4.81-5.67 solar radii, 263 + or - 39 pc, and anintensity mean absolute magnitude of +0.61 + or - 0.35. The largererrors quoted for RR Lyrae are due to uncertainties arising from theBlazhko effect. Results are discussed in the context of the dependenceof RR Lyrae absolute magnitudes on metal abundance.
| Photoelectric Observations of Rr-Lyrae in 1975
Not Available
| Photo-electric observations of RR Lyrae (Errata: 11 270)
Not Available
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Osservazione e dati astrometrici
| Costellazione: | Lira |
| Ascensione retta: | 19h26m05.50s |
| Declinazione: | +42°19'34.3" |
| Magnitudine apparente: | 7.985 |
| Distanza: | 137.552 parsec |
| Moto proprio RA: | 19.9 |
| Moto proprio Dec: | 44.6 |
| B-T magnitude: | 8.363 |
| V-T magnitude: | 8.017 |
Cataloghi e designazioni:
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